| 10 | ( | 10 | − | x | ) | + | x | x | × | 2 | − | 1 | = | 10 | x | + | ( | 10 | − | x | ) |
| Left side of the equation = | 10 | × | 10 | − | 10 | x | + | x | x | × | 2 | − | 1 |
| = | 100 | − | 10 | x | + | x | x | × | 2 | − | 1 |
| = | 99 | − | 10 | x | + | x | x | × | 2 |
| 99 | − | 10 | x | + | x | x | × | 2 | = | 10 | x | + | ( | 10 | − | x | ) |
| Right side of the equation = | 10 | x | + | 10 | − | x |
| = | 9 | x | + | 10 |
| 99 | − | 10 | x | + | x | x | × | 2 | = | 9 | x | + | 10 |